Electro-acoustic transducer

Abstract

An electro-acoustic transducer having a circular transducer plate arranged in a transducer housing, clamped between two mounting members at its edge region, is provided with a piezoelectric layer. At least one seating region of the mounting member is of a rotationally asymmetrical shape to attenuate partial oscillations of a higher order. The electro-acoustic transducer is usable as a transducer for telephones.

We claim: 
     
       1. An electro-acoustic transducer, comprising: a transducer housing having mounting members, said mounting members including seating regions;   a circular transducer plate arranged in said transducer housing, edge regions of said transducer plate being clamped between said seating regions of said mounting members;   a pieze-electric member provided on said transducer plate;   at least one additional seating region of a rotational asymmetrical shape bearing against said transducer plate at a location radially inward of said seating regions of said mounting members to attenuate partial oscillations of circular resonances in said transducer plate.   
     
     
       2. An electro-acoustic transducer, comprising; a transducer housing having mounting members;   a circular transducer plate arranged in said transducer housing, edge regions of said transducer plate being clamped between said mounting members;   a piezo-electric member provided on said transducer plate;   said mounting members having at least one seating region of a rotationally asymmetrical shape; and   said transducer housing having two mounting members, both of which are of a rotationally asymmetrical shape and are arranged relative to said transducer plate at seating regions lying opposite one another.   
     
     
       3. An electro-acoustic transducer, comprising; a transducer housing having mounting members;   a circular transducer plate arranged in said transducer housing, edge regions of said transducer plate being clamped between said mounting members;   a piezo-electric member provided on said transducer plate;   said mounting members having at least one seating region of a rotationally asymmetrical shape; and   said at least one seating region being formed by a first annular projection that divides into two partial rings in one sector.   
     
     
       4. An electro-acoustic transducer as claimed in claim 1, wherein said at least one seating region of said mounting members is formed by planar surfaces. 
     
     
       5. An electro-acoustic transducer as claimed in claim 4, wherein said planar surfaces are of different sizes. 
     
     
       6. An electro-acoustic transducer as claimed in claim 1, wherein said mounting members are formed in one piece with parts of said transducer housing.